Furnace.



PATENTED DEC. 22, 1903. H. H. HUPP.

FURNACE.

APPLICATION FILED JUNE 1, 1903.

3 SHEETS-SHEET 1.

N0 MODEL.

- No. 747,718. PATENTED DEC. 22, 1903.

H. H. HUFF.

- FURNACE.

APPLIOATION FILED JUNE 1, 1903.

3 SHEETS-SHEET 2.

N0 MODEL.

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THE- non'rils PETERS c0. Pno'rour PATENTED DEC. 22; 1903;

H. HUFF.

FURNACE. APPLICATION FILED JUNE 1 1903.

3 SHEETS-SHEET 3.

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ratente fbecmbei- 22, 1903*.

UNITED STATES-PATENT OFFICE.

HENRY HQHUFF, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO HUFF LOCO MOTIVEAPPLIANCE COMPANY, OF KITTERY, MAINE, A CORPORATION OF MAINE.

FURNACE.

SPECIFICATION formingpart of Letters Patent No. 747,71 dated ecember 2Application filed June 1, 1903. Serial No. 1 i 111011619 6 Thisinvention relates to furnace or fire-box' doors, and particularly todoors of thefurnaces or fire-boxes of locomotive-engines, al-' IO thoughmy invention is not limited to this use and may be appliedto's'tationary or other engines as well as'to locomotives.

The invention has for its chief object to provide a two-part door composed of a hinged up- I per section adapted to swingon'a horizontal axisand a sliding lower section which is connected with the upper section insuch mannor that the two sections are opened and closed simultaneously,the sliding section constituting a counterbalance to support theswinging section in any desired position and reduce the labor or forcerequired to open and close the sections to the minimum.

, The invention also has for itsob'ject to provide certain incidentalimprovements; and it consists .in the several improvements which I willnow proceed todescribeand claim.

Of the accompanying drawings, forming a part of thisspecificatiom'Figure 1' represents 0 a front elevation of a furnace-doorand its casingembodying my invention. Fig. 2 represents a section online 2 2 of Fig. 1. Fig.- 3 represents an edge or end elevation, a partof the furnace-wall being shown in section.

Fig. 4 represents a section on line 4 4 of Fig.

1. Fig. 5 represents a section on line 5 5 of Fig. 1. Fig. 6 representsa View similar to Fig. 2, showing the door-sections opened. Fig. 7represents a section'online 7 7 of Fig. 0 1. Fig. 8 represents a frontelevation showing the doors open. Fig. 9 represents an end view-showingthe doors open. Fig. 10 rep resents an elevation of the back wall of alocomotive fire-box provided with my improved door. Fig. 11 represents aperspective view of the body portion of the door-easing. Figs. 12, 13,14, and 15 represent perspective views of detached parts hereinafterreferred to. Fig. 16 represents aview similar to Fig. 1, showing acounterbalancing-weight. Fig. 17

same parts in all the figures.

In carrying out my invention I provide a door-casing whichpreferablyincludes a body or frame portion 12 of the general form shownin Fig. 11, the same having a dooropening 13 and being adapted to bebolted or otherwise secured to the back wall 14 of a furnaceorffire-box. 7o

15. represents a swinging door section which is hinged to the casing-12,the preferred connection between the section 15 and casing 12 being bymeans of. arms or trunnions 17 17, formed on 01' affixed to the section15, and

' bearings on the door-casing composed of lower sections 18 at oppositeendsofthe door-opening, and upper sections 19, formed 011 a cast ing 20,which is bolted to the casing 12 above the door opening. Thedoor-section 15 is adapted to swing inwardly'into the fire-box.

21 represents the lower or sliding section of the door, which is movablevertically on the casing, its movements being controlled by guides withwhich'the casing is provided, as

hereinafter described. Theslidi'ng section 21 is provided at its endswith oppositely-projecting arms or trunnions 22, which are connected bylinks or rods 23 with the. swinging ends of arms 24, affixed to thetrunnions 17 of 0 the swinging section, the arrangement being such thatwhen theswinging section is opened or swung inwardly the arms 24 aredepressed and permit the downward movement of the sliding section 21,thus'fully uncovering the door-opening, as shown in Figs. 6, 8, and 9.

It will be seen that the sliding section 21 is caused by the describedconnections'between it and the swinging section 15 to act as acounterbalance for the latter, theswinging lOO section being retained bythe sliding section in any position to which it may be adjusted. Owingto the fact that the two sections are thus counterbalanced the laborrequired in opening and closing the sections is reduced to the minimum.

25 25 represent guides composed of vertical strips or bars affixed toprojections 26 27, Fig. 11, on the outer face of the casing 12, theportions of the guides between said projections being separated from thecasing by vertical spaces which receive squared portions 28, Fig. 15,formed on the sliding section'2l. The guides 25 prevent the slidingsection 21 from being displaced sidewise or outwardly from the casing12. Endwise displacement of the sliding section 21 is prevented by avertical guiding rib or member 29, formed onthe casing below thedoor-opening, and a complemental guiding member formed as a verticalgroove 30 in the inner side of the sliding section 21, the said grooveengaging the rib 29.

31 represents a lever or handle fast to one of the trunnions 17 toenable the operator to open and close the door-sections. To provideagainst loose movements of the door-sections, I provide retaining meanscomprising a fixed segmental arm 32, afiixed to the firebox wall andprovided with a series of bosses 33, and a yieldingly-supported latch ordetcnt member 34, mounted on studs 35, which are supported by theoperating-lever 31 and pressed outwardly by springs 36 into engagementwith the bosses 33. When the member 34 is between any two of the bosses,the lever cannot be moved to carry the member 34 across either of saidbosses without the application of suflicient force to overcomethesprings 36.

It will be seen that the two sections 15 and 21 operated simultaneouslyenable the dooropening to be quickly opened and closed with a slighteffort on the part of the operator and enable an opening of any desiredsize to be continuously maintainedt-hat is to say, the door-sections maybe left at various positions between their extreme open position andtheir extreme closed position.

In Figs. 19 and 20 I show means for adjusting the sliding section 21, sothat when the swinging section is closed and the sliding section israised to its fullest extent there may be still an opening of anydesired width left between the adjacent edges of the two sections forthe admission of any fixed amount of oxygen. To this end I provide thelower portion of the links 23 with longitudinal slots 37, in which thearms 22 of the sliding section 21 are vertically adjustable, the saidarms being supported in the slots 37 by means of stoppins 38, insertedin the slotted portions of the links, there being a series of orifices39 formed in the slotted portions of the links at diflerent heights topermit the pins 38 and the sliding sections 21 to be correspondinglyadjusted.

In Figs. 16, 17, 18, and 19 I show an additionalcounterbalancing-weight40,suspended by a rod 41 from the operating-lever31. Said weight, which may be made in sections, so that it can beincreased or diminished, is intended as an auxiliary to the slidingsection 21. The operating-lever 31 is provided with an arm or extension42, in which is formed a slot 43. Said slot receives a pin 44, whichconnects the upper end of the link 41 with the arm 42. The arrangementis such that when the doorsection 15 is closed, as shown in Fig. 17, theslot 43 is inclined in such direction as to cause the pin 44 to move tothe inner end of the slot. When the pin is in this position, theoperative length of the arm 42 is so reduced that the etfective force ofthe weight 40 is reduced to the minimum. When the door is opened, asshown in Fig. 18, the slot 43 assumes an opposite inclination and thepin 44 is caused to move to the outer end of the slot, thus increasingthe effective force of the weight 40. The weight 40 and the describedconnections between it and the swinging door are not claimed herein, thesame being shown and claimed in Letters Patent No. 726,298, dated April28, 1903. In the present case I have added to the devices shown in saidpatent means for securing the pin 44 rigidly at any desired point in theslot 43, said means comprising a thumb-nut 45, engaged with the threadedend of the pin or bolt 44, said nut cooperating with the head 46 of saidbolt in causing the two plates 47 47, which are connected with the upperend of the link 41, to bind firmly upon the opposite sides of the arm42, and thusimmovably secure said plates and the pin 44 to the arm 42.If the pin is thus secured to the arm when the parts are in the positionshown in Fig. 18, the weight 40 will tend to hold the door-section 15open so long as the pin remains engaged with the arm 42.

I claim- 1. A furnace-door comprising a hinged upper section, and avertically-movable lower section serving also as a counterbalance forthe hinged section.

2. A furnace-door comprising a hinged upper section, avertically-movable lower section, and connections between the twosections for imparting movement from one section to the other.

3. A furnace-door comprising a hinged upper section, avertically-movable lower section, and means for simultaneously movingsaid sections to and from their closed and open positions.

4. A furnace-door comprising a hinged upper section, avertically-movable lower section, swinging arms engaged with the uppersection, and rods or links connecting the swinging ends of said armswith the lower section.

5. The combination of a door-casing having bearings at its upper portionand vertical guides below said bearings, a swinging doorsection havingtrunnions journaled in said bearings, a sliding door-section engagedwith said guides, and connections between the two sections.

6. The combination of a door-casing having bearings at its upperportion, vertical end guides below said bearings at opposite ends of thedoor-opening, and a central ver tical guide or rib below thedoor-opening, a swinging door-section having trunnions journaled, insaid bearings, a sliding door-section having arms at its ends engagedwith said end guides, andacentral guiding member-engaged with thecentral guide-swinging arms affixed to the said trnnnions, and rods orlinks con necting said swinging arms with the arms on the slidingsection.

7. A furnace-door comprising a hinged upper section, avertically-movable lower section, connections betweenthetwo sections forimparting movement from one section to the other,and means for retainingsaid sections in different positions.

8. A furnace-door comprising a hinged upper section, avertically-movable lower section, connections between the two sectionsfor imparting movement from one section to the other, a lever affixed tothe hinged section and provided with a spring-pressed detent member, anda fixed arm provided witha series of projections adapted to cooperatewith said detent member.

9. A furnace-door comprising a hinged upper section, avertically-movable lower section, swinging arms engaged with the uppersection, and rods or links pivoted to the swinging arms and adjustablyconnected with the lower section, whereby the latter may be adjustedrelatively to the swinging section.

10. The combination of a hinged door, a slotted arm affixed to the door,a counterbalancing-weight, a link connected with the weight, a slidableconnection between the link and the slotted arm, and means for securingsaid connection at any point within the range of its sliding movement.

In testimony whereof I have afiixed my signature in presence of twowitnesses.

HENRY H. HUFF.

